Enhanced Lithium Storage of an Organic Cathode via the Bipolar Mechanism

Tianyuan Liu, Ki Chul Kim, Byeongyong Lee, Shikai Jin, Michael J. Lee, Mochen Li, Suguru Noda, Seung Soon Jang, Seung Woo Lee*

*この研究の対応する著者

研究成果: Article査読

10 被引用数 (Scopus)

抄録

Electrochemically polymerized anthraquinone derivatives on conductive carbon nanotubes are redox-active as organic cathode materials for lithium-ion batteries. Density functional theory calculations and electrochemical measurements reveal that the polymerized anthraquinone cathodes exhibit the multiple redox reactions with electrolyte ions through a bipolar charge storage mechanism: (1) the n-type doping/dedoping mechanism associated with Li+ binding in a potential window of 1.5-3.0 V versus Li and (2) the PF6-involved p-type doping/dedoping mechanism in a potential window of 3.0-4.5 V versus Li. Polymerized 1-aminoanthraquinone (AAQ) shows progressive deactivation upon cycling because of the charge trapping effect. On the other hand, the polymerized 1,5-diaminoanthraquinone (DAAQ) delivers extraordinarily high charge capacities up to 311 mA h/g while effectively avoiding undesirable charge trapping behaviors. We establish the relationship between the structure and charge storage performance of the polymerized quinone derivatives, suggesting a high-performance organic cathode material for rechargeable battery applications.

本文言語English
ページ(範囲)3728-3735
ページ数8
ジャーナルACS Applied Energy Materials
3
4
DOI
出版ステータスPublished - 2020 4月 27

ASJC Scopus subject areas

  • 化学工学(その他)
  • エネルギー工学および電力技術
  • 電気化学
  • 材料化学
  • 電子工学および電気工学

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